z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
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Activating a CP-CP contention-loser session

z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
GC27-3667-00

Figure 1. CP-CP contention-loser session activation
Diagram of CP-CP contention-loser session activation.
  1. The BIND for the contention loser CP-CP session is received from the adjacent node.
  2. The BIND drives the SCIP exit routine.
  3. The SCIP exit causes APPC to issue an OPNSEC macroinstruction to establish a session between APPC (operating as the SLU) and the PLU that sent the BIND.
  4. The OPNSEC macroinstruction causes a BIND response to be sent to the adjacent node.
  5. The OPNSEC is posted complete.
  6. APPC receives from the adjacent node a PIU containing the CP Capabilities of the adjacent CP. The PIU also contains an FMH-5 specifying that the CP Capabilities Transaction Program (TP) is to be attached.
  7. APPC sends an ATTACH_TP AMU to TP Services to request the attachment of the CP Capabilities TP.
  8. After attachment, the CP Capabilities TP issues an APPCCMD CONTROL=RECEIVE,QUALIFY=SPEC instruction to receive the CP Capabilities of the adjacent CP.
  9. APPC posts the APPCCMD CONTROL=RECEIVE,QUALIFY=SPEC macroinstruction complete.
  10. The CP Capabilities TP builds and sends to the CP a CP_CP_SESSION_ACT signal, containing the contention loser Conversation Group Identifier (CGID) and the CP Capabilities of the adjacent CP.
  11. The CP sends to the CP Capabilities TP a CP_CP_SESSION_ACT_REPLY. It contains the CP Capabilities of this node and also indicates whether SSC was able to successfully process the CONLOSER activation request.
  12. After receiving the CP_CP_SESSION_ACT_REPLY, the CP Capabilities TP issues an APPCCMD CONTROL=SEND,QUALIFY=DATA to send the CP Capabilities to the adjacent CP.
  13. A PIU with the CP Capabilities is transmitted to the adjacent CP.
  14. When the transmission is complete, the APPCCMD CONTROL=SEND, QUALIFY=DATA macroinstruction is posted complete by APPC.
  15. The CP Capabilities TP issues an APPCCMD CONTROL=DEALLOC, QUALIFY=FLUSH macroinstruction to flush the local LU send buffer and deallocate the conversation normally.
  16. APPC posts the APPCCMD CONTROL=DEALLOC,QUALIFY=FLUSH macroinstruction back upon completion.
Parent topic: Index of CP-CP session flows

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